BÀI 6 R1=12 ; R2=24 ; R3=12 ; I2=1A ; Uab=?
BÀI 7 R1=24 ; R2=R3=12 ; Uab=50V ; I1=1,25 ; R4=?

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Which of these metals are magnetic?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.